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Schedule I - Condensed Financial Information of Parent Condensed Financial Information of Parent Company, Balance Sheet (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Cash and cash equivalents $ 3,209 $ 2,278 $ 2,607 $ 2,963 $ 2,256 $ 2,917
Other assets 753 623   659    
Total Assets 24,026 25,147   21,347    
Accrued expenses and other liabilities 1,554.0 1,317.0   2,277.0    
Debt 8,196 6,463   6,498    
Total liabilities 14,303 17,293   13,433    
Commitments and contingencies              
Limited partner 4,859 4,087   3,521    
General partner (303) (311)   (318)    
Total equity 9,723 7,854   7,914 7,274 6,800
Total Liabilities and Equity 24,026 25,147   21,347    
Parent Company [Member]
            
Cash and cash equivalents   24   204 82 291
Other assets   158   142    
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures   6,805   6,072    
Total Assets   6,987   6,418    
Accrued expenses and other liabilities   99.0   100.0    
Debt   3,112   3,115    
Total liabilities   3,211   3,215    
Limited partner   4,087   3,521    
General partner   (311)   (318)    
Total equity   3,776   3,203    
Total Liabilities and Equity   $ 6,987   $ 6,418